Abstract
Heat capacity C p(T) of the crystalline dl-cysteine was measured on heating the system from 6 to 309 K by adiabatic calorimetry; thermodynamic functions were calculated based on these data smoothed in the temperature range 6–273.15 K. The values of heat capacity, entropy, and enthalpy at 273.15 K were equal to 142.4, 153.3, and 213.80 J K−1 mol−1, respectively. At about 300 K, a heat capacity peak was observed, which was interpreted as an evidence of a first-order phase transition. The enthalpy and the entropy of the transition are equal, respectively, to 2300 ± 50 and 7.6 ± 0.1 J K−1 mol−1.
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Notes
Due to a technical reason, the manuscript has been stuck in the production process, so that by the time, when this paper is being published, the structural and spectroscopic experiments have been successfully carried out in our group by other researchers (see [21]) and the results have confirmed the correctness of the assumptions made in this study based on calorimetry.
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Acknowledgements
The authors are grateful to Dr. T.N. Drebushchak for the X-ray characterization of the sample and to Dr. N.A. Pankrushina for the measurements of optical activity, and Dr. I.N. Azarova for the chromatographic analysis. The work was supported by the Integration Projects #49 and #110 of the SB RAS, by a grant from RFBR (05-03-32468), and grants from BRHE (NO-008-XI/BG6108 and RUX0-008-NO-06).
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Paukov, I.E., Kovalevskaya, Y.A. & Boldyreva, E.V. Low-temperature thermodynamic properties of dl-cysteine. J Therm Anal Calorim 100, 295–301 (2010). https://doi.org/10.1007/s10973-009-0457-x
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DOI: https://doi.org/10.1007/s10973-009-0457-x